[tahoe-dev] zfec: bug with m=16 k=13 parameters at certain file length

[Bodecs Bela]

update#1:  between 6176756 and 6176767 all input file size can produce
this bug.
I noticed that this range is 12 which is k-1. I think this bug relates
somehow to padding.

bb

2013.09.11. 11:16 keltezéssel, Bodecs Bela írta:
> Hi All,
>
> please confirm the following bug:
>
> zfec command line tool, version: 1.4.24
>
> steps to reproduce:
>
> create any file with length of 6176761 byte. Name it test.file
>
> zfec this file with the command line tool using parameters m=16 k=13
>
>  zfec  -p fec_file -m 16 -k 13 -v test.file
>
> then unfec the resulted chunks:
>
> zunfec -o test.file.unfec fec_file.00_16.fec fec_file.01_16.fec
> fec_file.02_16.fec fec_file.03_16.fec fec_file.04_16.fec
> fec_file.05_16.fec fec_file.06_16.fec fec_file.07_16.fec
> fec_file.08_16.fec fec_file.09_16.fec fec_file.10_16.fec
> fec_file.11_16.fec fec_file.12_16.fec fec_file.13_16.fec
>
> the result file (test.file.unfec) will be a 6176768 byte sized file.
> (but it should be 6176761 bytes long)
> If you investigate the resulted file, you will see, that there are 7
> extra zero bytes at the end of the file.
>
> I have tested this file size with other k and m but I could not find any
> other affected parameters to reproduce this bug.
> And I could not find any other file size to reproduce this bug with m=16
> and k=13 parameters.
>
> Thank you in advance,
>
> DoubleB
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